③axon(轴突) ●thin, less branch axon hillock(轴丘): the beginning without Niss!body ° axolemma ● axoplasm ---Function: initiate an impulse and conduct the impulse③ axon(轴突): ⚫ thin, less branch ⚫ axon hillock(轴丘): the beginning without Nissl body ⚫ axolemma ⚫ axoplasm ---Function: initiate an impulse and conduct the impulse